The difference between the illiterate population and the literate population of City C is

Concept Used:-

The percentage is the number or ratio which can be expression in the fraction of hundred.

For example, if we have to find out the x% of 50. Then, we have to divide x with 100 and multiplied with 50.

\(x\% \text{ of }50=\dfrac{x}{100}\times50\)

Explanation:-

Total population of city C using the above formula,

\(\Rightarrow \rm Total \ Population=\dfrac{21}{100}\times15000000\\ \Rightarrow \rm Total \ Population=3150000\)

Total literate population of city C,

⇒ Literate population = Literate Males + Literate Females\(\Rightarrow \rm Literate \ Population= \dfrac{20}{100}\times4000000+\dfrac{12}{100}\times2500000\\ \Rightarrow \rm Literate \ Population= 800000+300000\\ \Rightarrow \rm Literate \ Population= 1100000\)

Now, total illiterate population,

⇒ Illiterate population = Total population - Literate population

⇒ Illiterate population = 3150000 - 1100000

⇒ Illiterate population = 2050000

difference between the illiterate population and the literate population,

⇒ 2050000 - 110000 = 950000

⇒ 2050000 - 110000 = 9.5 lakh

So, the difference between the illiterate population and the literate population of City C is 9.5 lakh.

Hence, the correct option is 2.